The board is extremely future proof. That board could easily last you a good 5-6 years. That will enable you to drop in a higher CPU later and change nothing else. I could have suggested a very cheap board that wouldn't last as long, thus costing more in the long run. Besides, there aren't many quality boards that cost less than the CPU. Actually, now that I think of it, all of the top boards for each set of CPUs (AM3, LGA1156, LGA1366) cost more or the same as the CPUs for the board...
Also, don't forget that the CPU can be overclocked to a much higher clock speed, thus increasing it's value.
To be honest, I didn't notice the OS in the original build, but I still stand by the build above. However, this build is a lot higher quality and has a lot more future proofing potential. This is a build that you could upgrade over a few years and have a top notch system. The other system would need to be thrown in the trash after about a year or two.
The only things I would recommend switching to save some money is to change the CPU to a X3 425 to save $25 (combo with above board for $197) and/or switching the board to a Gigabyte GA-770TA-UD3 to save another $45 (combo with the X4 for $171 after rebate or combo with the X3 for $147 after rebate). However, switching the board would lose a lot of upgrade potential by only having one PCIe 2.0 slot. To build anything lower would be building yourself a computer that is already obsolete.